Finding the Fourth Proportional to 1,354.64, 1,870.80 and 1,004.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,354.64 : 1,870.80 = 1,004.72 : x
2. Step 2: Convert to fraction form
   1,354.64/1,870.80 = 1,004.72/x
3. Step 3: Cross multiply
   1,354.64x = 1,870.80 × 1,004.72
4. Step 4: Simplify right side
   1,354.64x = 1,879,630.18
5. Step 5: Solve for x
   x = 1,879,630.18/1,354.64
6. Step 6: Final answer
   x = 1,387.55