Finding the Fourth Proportional to 10,426.12, 15,617.32 and 7,123.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,426.12 : 15,617.32 = 7,123.76 : x
2. Step 2: Convert to fraction form
   10,426.12/15,617.32 = 7,123.76/x
3. Step 3: Cross multiply
   10,426.12x = 15,617.32 × 7,123.76
4. Step 4: Simplify right side
   10,426.12x = 111,254,039.52
5. Step 5: Solve for x
   x = 111,254,039.52/10,426.12
6. Step 6: Final answer
   x = 10,670.70