Finding the Fourth Proportional to 388,976,397.34, 536,781,112.32 and 212,762,851.34

Step by Step Solution

1. Step 1: Write the proportion equation
   388,976,397.34 : 536,781,112.32 = 212,762,851.34 : x
2. Step 2: Convert to fraction form
   388,976,397.34/536,781,112.32 = 212,762,851.34/x
3. Step 3: Cross multiply
   388,976,397.34x = 536,781,112.32 × 212,762,851.34
4. Step 4: Simplify right side
   388,976,397.34x = 114,207,080,002,660,000
5. Step 5: Solve for x
   x = 114,207,080,002,660,000/388,976,397.34
6. Step 6: Final answer
   x = 293,609,280.11