Finding the Fourth Proportional to 388,665,830.28, 536,358,870.54 and 212,454,522.84

Step by Step Solution

1. Step 1: Write the proportion equation
   388,665,830.28 : 536,358,870.54 = 212,454,522.84 : x
2. Step 2: Convert to fraction form
   388,665,830.28/536,358,870.54 = 212,454,522.84/x
3. Step 3: Cross multiply
   388,665,830.28x = 536,358,870.54 × 212,454,522.84
4. Step 4: Simplify right side
   388,665,830.28x = 113,951,867,911,577,040
5. Step 5: Solve for x
   x = 113,951,867,911,577,040/388,665,830.28
6. Step 6: Final answer
   x = 293,187,255.05