Finding the Fourth Proportional to 101,098.68, 139,514.85 and 55,778.57

Step by Step Solution

1. Step 1: Write the proportion equation
   101,098.68 : 139,514.85 = 55,778.57 : x
2. Step 2: Convert to fraction form
   101,098.68/139,514.85 = 55,778.57/x
3. Step 3: Cross multiply
   101,098.68x = 139,514.85 × 55,778.57
4. Step 4: Simplify right side
   101,098.68x = 7,781,938,826.76
5. Step 5: Solve for x
   x = 7,781,938,826.76/101,098.68
6. Step 6: Final answer
   x = 76,973.69