Finding the Fourth Proportional to 2,188.61, 3,282.50 and 707.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.61 : 3,282.50 = 707.86 : x
2. Step 2: Convert to fraction form
   2,188.61/3,282.50 = 707.86/x
3. Step 3: Cross multiply
   2,188.61x = 3,282.50 × 707.86
4. Step 4: Simplify right side
   2,188.61x = 2,323,540.47
5. Step 5: Solve for x
   x = 2,323,540.47/2,188.61
6. Step 6: Final answer
   x = 1,061.65