Finding the Fourth Proportional to 9,142.71, 12,607.99 and 5,558.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,142.71 : 12,607.99 = 5,558.16 : x
2. Step 2: Convert to fraction form
   9,142.71/12,607.99 = 5,558.16/x
3. Step 3: Cross multiply
   9,142.71x = 12,607.99 × 5,558.16
4. Step 4: Simplify right side
   9,142.71x = 70,077,225.70
5. Step 5: Solve for x
   x = 70,077,225.70/9,142.71
6. Step 6: Final answer
   x = 7,664.82