Finding the Fourth Proportional to 78,732,128.70, 109,969,888.50 and 78,732,128.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,732,128.70 : 109,969,888.50 = 78,732,128.70 : x
2. Step 2: Convert to fraction form
   78,732,128.70/109,969,888.50 = 78,732,128.70/x
3. Step 3: Cross multiply
   78,732,128.70x = 109,969,888.50 × 78,732,128.70
4. Step 4: Simplify right side
   78,732,128.70x = 8,658,163,414,506,650
5. Step 5: Solve for x
   x = 8,658,163,414,506,650/78,732,128.70
6. Step 6: Final answer
   x = 109,969,888.50