Finding the Fourth Proportional to 139,613.72, 209,419.62 and 56,506.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,613.72 : 209,419.62 = 56,506.52 : x
2. Step 2: Convert to fraction form
   139,613.72/209,419.62 = 56,506.52/x
3. Step 3: Cross multiply
   139,613.72x = 209,419.62 × 56,506.52
4. Step 4: Simplify right side
   139,613.72x = 11,833,573,945.92
5. Step 5: Solve for x
   x = 11,833,573,945.92/139,613.72
6. Step 6: Final answer
   x = 84,759.39