Finding the Fourth Proportional to 1,398.71, 2,095.80 and 740.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.71 : 2,095.80 = 740.57 : x
2. Step 2: Convert to fraction form
   1,398.71/2,095.80 = 740.57/x
3. Step 3: Cross multiply
   1,398.71x = 2,095.80 × 740.57
4. Step 4: Simplify right side
   1,398.71x = 1,552,086.61
5. Step 5: Solve for x
   x = 1,552,086.61/1,398.71
6. Step 6: Final answer
   x = 1,109.66