Finding the Fourth Proportional to 1,259.64, 1,737.72 and 909.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259.64 : 1,737.72 = 909.72 : x
2. Step 2: Convert to fraction form
   1,259.64/1,737.72 = 909.72/x
3. Step 3: Cross multiply
   1,259.64x = 1,737.72 × 909.72
4. Step 4: Simplify right side
   1,259.64x = 1,580,838.64
5. Step 5: Solve for x
   x = 1,580,838.64/1,259.64
6. Step 6: Final answer
   x = 1,254.99