Finding the Fourth Proportional to 139,610.72, 209,415.12 and 56,503.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,610.72 : 209,415.12 = 56,503.52 : x
2. Step 2: Convert to fraction form
   139,610.72/209,415.12 = 56,503.52/x
3. Step 3: Cross multiply
   139,610.72x = 209,415.12 × 56,503.52
4. Step 4: Simplify right side
   139,610.72x = 11,832,691,421.22
5. Step 5: Solve for x
   x = 11,832,691,421.22/139,610.72
6. Step 6: Final answer
   x = 84,754.89