Finding the Fourth Proportional to 12,457.72, 17,191.02 and 7,152.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,457.72 : 17,191.02 = 7,152.76 : x
2. Step 2: Convert to fraction form
   12,457.72/17,191.02 = 7,152.76/x
3. Step 3: Cross multiply
   12,457.72x = 17,191.02 × 7,152.76
4. Step 4: Simplify right side
   12,457.72x = 122,963,240.22
5. Step 5: Solve for x
   x = 122,963,240.22/12,457.72
6. Step 6: Final answer
   x = 9,870.45