Finding the Fourth Proportional to 1,426.31, 2,139.35 and 560.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.31 : 2,139.35 = 560.62 : x
2. Step 2: Convert to fraction form
   1,426.31/2,139.35 = 560.62/x
3. Step 3: Cross multiply
   1,426.31x = 2,139.35 × 560.62
4. Step 4: Simplify right side
   1,426.31x = 1,199,362.27
5. Step 5: Solve for x
   x = 1,199,362.27/1,426.31
6. Step 6: Final answer
   x = 840.89