Finding the Fourth Proportional to 2,572.40, 3,549.92 and 1,393.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,572.40 : 3,549.92 = 1,393.47 : x
2. Step 2: Convert to fraction form
   2,572.40/3,549.92 = 1,393.47/x
3. Step 3: Cross multiply
   2,572.40x = 3,549.92 × 1,393.47
4. Step 4: Simplify right side
   2,572.40x = 4,946,699.81
5. Step 5: Solve for x
   x = 4,946,699.81/2,572.40
6. Step 6: Final answer
   x = 1,922.99