Finding the Fourth Proportional to 99,890.38, 137,855.10 and 57,448

Step by Step Solution

1. Step 1: Write the proportion equation
   99,890.38 : 137,855.10 = 57,448 : x
2. Step 2: Convert to fraction form
   99,890.38/137,855.10 = 57,448/x
3. Step 3: Cross multiply
   99,890.38x = 137,855.10 × 57,448
4. Step 4: Simplify right side
   99,890.38x = 7,919,499,784.80
5. Step 5: Solve for x
   x = 7,919,499,784.80/99,890.38
6. Step 6: Final answer
   x = 79,281.91