Finding the Fourth Proportional to 139,629.72, 209,443.86 and 56,523

Step by Step Solution

1. Step 1: Write the proportion equation
   139,629.72 : 209,443.86 = 56,523 : x
2. Step 2: Convert to fraction form
   139,629.72/209,443.86 = 56,523/x
3. Step 3: Cross multiply
   139,629.72x = 209,443.86 × 56,523
4. Step 4: Simplify right side
   139,629.72x = 11,838,395,298.78
5. Step 5: Solve for x
   x = 11,838,395,298.78/139,629.72
6. Step 6: Final answer
   x = 84,784.21