Finding the Fourth Proportional to 1,290.00, 1,780.17 and 700.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.00 : 1,780.17 = 700.53 : x
2. Step 2: Convert to fraction form
   1,290.00/1,780.17 = 700.53/x
3. Step 3: Cross multiply
   1,290.00x = 1,780.17 × 700.53
4. Step 4: Simplify right side
   1,290.00x = 1,247,059.86
5. Step 5: Solve for x
   x = 1,247,059.86/1,290.00
6. Step 6: Final answer
   x = 966.72