Finding the Fourth Proportional to 99,912, 137,882.52 and 57,470.48

Step by Step Solution

1. Step 1: Write the proportion equation
   99,912 : 137,882.52 = 57,470.48 : x
2. Step 2: Convert to fraction form
   99,912/137,882.52 = 57,470.48/x
3. Step 3: Cross multiply
   99,912x = 137,882.52 × 57,470.48
4. Step 4: Simplify right side
   99,912x = 7,924,174,608.01
5. Step 5: Solve for x
   x = 7,924,174,608.01/99,912
6. Step 6: Final answer
   x = 79,311.54