Finding the Fourth Proportional to 1,665.19, 2,498.78 and 740.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.19 : 2,498.78 = 740.80 : x
2. Step 2: Convert to fraction form
   1,665.19/2,498.78 = 740.80/x
3. Step 3: Cross multiply
   1,665.19x = 2,498.78 × 740.80
4. Step 4: Simplify right side
   1,665.19x = 1,851,096.22
5. Step 5: Solve for x
   x = 1,851,096.22/1,665.19
6. Step 6: Final answer
   x = 1,111.64