Finding the Fourth Proportional to 1,117.83, 1,672.71 and 838.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,117.83 : 1,672.71 = 838.47 : x
2. Step 2: Convert to fraction form
   1,117.83/1,672.71 = 838.47/x
3. Step 3: Cross multiply
   1,117.83x = 1,672.71 × 838.47
4. Step 4: Simplify right side
   1,117.83x = 1,402,517.15
5. Step 5: Solve for x
   x = 1,402,517.15/1,117.83
6. Step 6: Final answer
   x = 1,254.68