Finding the Fourth Proportional to 1,403.72, 1,937.22 and 782.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.72 : 1,937.22 = 782.72 : x
2. Step 2: Convert to fraction form
   1,403.72/1,937.22 = 782.72/x
3. Step 3: Cross multiply
   1,403.72x = 1,937.22 × 782.72
4. Step 4: Simplify right side
   1,403.72x = 1,516,300.84
5. Step 5: Solve for x
   x = 1,516,300.84/1,403.72
6. Step 6: Final answer
   x = 1,080.20