Finding the Fourth Proportional to 9,026.40, 12,457.86 and 5,490.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,026.40 : 12,457.86 = 5,490.72 : x
2. Step 2: Convert to fraction form
   9,026.40/12,457.86 = 5,490.72/x
3. Step 3: Cross multiply
   9,026.40x = 12,457.86 × 5,490.72
4. Step 4: Simplify right side
   9,026.40x = 68,402,621.06
5. Step 5: Solve for x
   x = 68,402,621.06/9,026.40
6. Step 6: Final answer
   x = 7,578.06