Finding the Fourth Proportional to 1,081.40, 1,620.94 and 560.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.40 : 1,620.94 = 560.88 : x
2. Step 2: Convert to fraction form
   1,081.40/1,620.94 = 560.88/x
3. Step 3: Cross multiply
   1,081.40x = 1,620.94 × 560.88
4. Step 4: Simplify right side
   1,081.40x = 909,152.83
5. Step 5: Solve for x
   x = 909,152.83/1,081.40
6. Step 6: Final answer
   x = 840.72