Finding the Fourth Proportional to 99,239,766.57, 136,930,808.61 and 57,978,687.33

Step by Step Solution

1. Step 1: Write the proportion equation
   99,239,766.57 : 136,930,808.61 = 57,978,687.33 : x
2. Step 2: Convert to fraction form
   99,239,766.57/136,930,808.61 = 57,978,687.33/x
3. Step 3: Cross multiply
   99,239,766.57x = 136,930,808.61 × 57,978,687.33
4. Step 4: Simplify right side
   99,239,766.57x = 7,939,068,538,243,262
5. Step 5: Solve for x
   x = 7,939,068,538,243,262/99,239,766.57
6. Step 6: Final answer
   x = 79,998,863.49