Finding the Fourth Proportional to 1,439.10, 2,156.55 and 707.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.10 : 2,156.55 = 707.82 : x
2. Step 2: Convert to fraction form
   1,439.10/2,156.55 = 707.82/x
3. Step 3: Cross multiply
   1,439.10x = 2,156.55 × 707.82
4. Step 4: Simplify right side
   1,439.10x = 1,526,449.22
5. Step 5: Solve for x
   x = 1,526,449.22/1,439.10
6. Step 6: Final answer
   x = 1,060.70