Finding the Fourth Proportional to 99,896.67, 137,851.88 and 57,455.91

Step by Step Solution

1. Step 1: Write the proportion equation
   99,896.67 : 137,851.88 = 57,455.91 : x
2. Step 2: Convert to fraction form
   99,896.67/137,851.88 = 57,455.91/x
3. Step 3: Cross multiply
   99,896.67x = 137,851.88 × 57,455.91
4. Step 4: Simplify right side
   99,896.67x = 7,920,404,923.33
5. Step 5: Solve for x
   x = 7,920,404,923.33/99,896.67
6. Step 6: Final answer
   x = 79,285.98