Finding the Fourth Proportional to 101,002.80, 139,377.60 and 55,681.18

Step by Step Solution

1. Step 1: Write the proportion equation
   101,002.80 : 139,377.60 = 55,681.18 : x
2. Step 2: Convert to fraction form
   101,002.80/139,377.60 = 55,681.18/x
3. Step 3: Cross multiply
   101,002.80x = 139,377.60 × 55,681.18
4. Step 4: Simplify right side
   101,002.80x = 7,760,709,233.57
5. Step 5: Solve for x
   x = 7,760,709,233.57/101,002.80
6. Step 6: Final answer
   x = 76,836.58