Finding the Fourth Proportional to 99,911.88, 137,884.86 and 57,469.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,911.88 : 137,884.86 = 57,469.50 : x
2. Step 2: Convert to fraction form
   99,911.88/137,884.86 = 57,469.50/x
3. Step 3: Cross multiply
   99,911.88x = 137,884.86 × 57,469.50
4. Step 4: Simplify right side
   99,911.88x = 7,924,173,961.77
5. Step 5: Solve for x
   x = 7,924,173,961.77/99,911.88
6. Step 6: Final answer
   x = 79,311.63