Finding the Fourth Proportional to 99,890.31, 137,852.79 and 57,448.86

Step by Step Solution

1. Step 1: Write the proportion equation
   99,890.31 : 137,852.79 = 57,448.86 : x
2. Step 2: Convert to fraction form
   99,890.31/137,852.79 = 57,448.86/x
3. Step 3: Cross multiply
   99,890.31x = 137,852.79 × 57,448.86
4. Step 4: Simplify right side
   99,890.31x = 7,919,485,633.32
5. Step 5: Solve for x
   x = 7,919,485,633.32/99,890.31
6. Step 6: Final answer
   x = 79,281.82