Finding the Fourth Proportional to 1,388.04, 1,913.88 and 916.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.04 : 1,913.88 = 916.32 : x
2. Step 2: Convert to fraction form
   1,388.04/1,913.88 = 916.32/x
3. Step 3: Cross multiply
   1,388.04x = 1,913.88 × 916.32
4. Step 4: Simplify right side
   1,388.04x = 1,753,726.52
5. Step 5: Solve for x
   x = 1,753,726.52/1,388.04
6. Step 6: Final answer
   x = 1,263.46