Finding the Fourth Proportional to 100,872.42, 139,202.78 and 55,549.50

Step by Step Solution

1. Step 1: Write the proportion equation
   100,872.42 : 139,202.78 = 55,549.50 : x
2. Step 2: Convert to fraction form
   100,872.42/139,202.78 = 55,549.50/x
3. Step 3: Cross multiply
   100,872.42x = 139,202.78 × 55,549.50
4. Step 4: Simplify right side
   100,872.42x = 7,732,644,827.61
5. Step 5: Solve for x
   x = 7,732,644,827.61/100,872.42
6. Step 6: Final answer
   x = 76,657.67