Finding the Fourth Proportional to 12,457.86, 17,190.03 and 7,152.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,457.86 : 17,190.03 = 7,152.90 : x
2. Step 2: Convert to fraction form
   12,457.86/17,190.03 = 7,152.90/x
3. Step 3: Cross multiply
   12,457.86x = 17,190.03 × 7,152.90
4. Step 4: Simplify right side
   12,457.86x = 122,958,565.59
5. Step 5: Solve for x
   x = 122,958,565.59/12,457.86
6. Step 6: Final answer
   x = 9,869.96