Finding the Fourth Proportional to 140,586.72, 210,880.16 and 57,480.72

Step by Step Solution

1. Step 1: Write the proportion equation
   140,586.72 : 210,880.16 = 57,480.72 : x
2. Step 2: Convert to fraction form
   140,586.72/210,880.16 = 57,480.72/x
3. Step 3: Cross multiply
   140,586.72x = 210,880.16 × 57,480.72
4. Step 4: Simplify right side
   140,586.72x = 12,121,543,430.52
5. Step 5: Solve for x
   x = 12,121,543,430.52/140,586.72
6. Step 6: Final answer
   x = 86,221.11