Finding the Fourth Proportional to 1,561.50, 2,155.14 and 940.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.50 : 2,155.14 = 940.50 : x
2. Step 2: Convert to fraction form
   1,561.50/2,155.14 = 940.50/x
3. Step 3: Cross multiply
   1,561.50x = 2,155.14 × 940.50
4. Step 4: Simplify right side
   1,561.50x = 2,026,909.17
5. Step 5: Solve for x
   x = 2,026,909.17/1,561.50
6. Step 6: Final answer
   x = 1,298.05