Finding the Fourth Proportional to 1,990.72, 2,746.72 and 1,292

Step by Step Solution

1. Step 1: Write the proportion equation
   1,990.72 : 2,746.72 = 1,292 : x
2. Step 2: Convert to fraction form
   1,990.72/2,746.72 = 1,292/x
3. Step 3: Cross multiply
   1,990.72x = 2,746.72 × 1,292
4. Step 4: Simplify right side
   1,990.72x = 3,548,762.24
5. Step 5: Solve for x
   x = 3,548,762.24/1,990.72
6. Step 6: Final answer
   x = 1,782.65