Finding the Fourth Proportional to 101,000.78, 139,382.04 and 55,680.53

Step by Step Solution

1. Step 1: Write the proportion equation
   101,000.78 : 139,382.04 = 55,680.53 : x
2. Step 2: Convert to fraction form
   101,000.78/139,382.04 = 55,680.53/x
3. Step 3: Cross multiply
   101,000.78x = 139,382.04 × 55,680.53
4. Step 4: Simplify right side
   101,000.78x = 7,760,865,162.77
5. Step 5: Solve for x
   x = 7,760,865,162.77/101,000.78
6. Step 6: Final answer
   x = 76,839.66