Finding the Fourth Proportional to 139,139.85, 208,709.78 and 69,155.85

Step by Step Solution

1. Step 1: Write the proportion equation
   139,139.85 : 208,709.78 = 69,155.85 : x
2. Step 2: Convert to fraction form
   139,139.85/208,709.78 = 69,155.85/x
3. Step 3: Cross multiply
   139,139.85x = 208,709.78 × 69,155.85
4. Step 4: Simplify right side
   139,139.85x = 14,433,501,893.43
5. Step 5: Solve for x
   x = 14,433,501,893.43/139,139.85
6. Step 6: Final answer
   x = 103,733.78