Finding the Fourth Proportional to 98,871.50, 136,442.67 and 56,429.12

Step by Step Solution

1. Step 1: Write the proportion equation
   98,871.50 : 136,442.67 = 56,429.12 : x
2. Step 2: Convert to fraction form
   98,871.50/136,442.67 = 56,429.12/x
3. Step 3: Cross multiply
   98,871.50x = 136,442.67 × 56,429.12
4. Step 4: Simplify right side
   98,871.50x = 7,699,339,798.55
5. Step 5: Solve for x
   x = 7,699,339,798.55/98,871.50
6. Step 6: Final answer
   x = 77,872.19