Finding the Fourth Proportional to 140,605.47, 210,909.02 and 57,499.47

Step by Step Solution

1. Step 1: Write the proportion equation
   140,605.47 : 210,909.02 = 57,499.47 : x
2. Step 2: Convert to fraction form
   140,605.47/210,909.02 = 57,499.47/x
3. Step 3: Cross multiply
   140,605.47x = 210,909.02 × 57,499.47
4. Step 4: Simplify right side
   140,605.47x = 12,127,156,580.72
5. Step 5: Solve for x
   x = 12,127,156,580.72/140,605.47
6. Step 6: Final answer
   x = 86,249.54