Finding the Fourth Proportional to 99,837.92, 137,776.32 and 57,404.80

Step by Step Solution

1. Step 1: Write the proportion equation
   99,837.92 : 137,776.32 = 57,404.80 : x
2. Step 2: Convert to fraction form
   99,837.92/137,776.32 = 57,404.80/x
3. Step 3: Cross multiply
   99,837.92x = 137,776.32 × 57,404.80
4. Step 4: Simplify right side
   99,837.92x = 7,909,022,094.34
5. Step 5: Solve for x
   x = 7,909,022,094.34/99,837.92
6. Step 6: Final answer
   x = 79,218.62