Finding the Fourth Proportional to 1,385.08, 2,078.12 and 654.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.08 : 2,078.12 = 654.10 : x
2. Step 2: Convert to fraction form
   1,385.08/2,078.12 = 654.10/x
3. Step 3: Cross multiply
   1,385.08x = 2,078.12 × 654.10
4. Step 4: Simplify right side
   1,385.08x = 1,359,298.29
5. Step 5: Solve for x
   x = 1,359,298.29/1,385.08
6. Step 6: Final answer
   x = 981.39