Finding the Fourth Proportional to 1,386.48, 2,077.92 and 1,200.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.48 : 2,077.92 = 1,200.72 : x
2. Step 2: Convert to fraction form
   1,386.48/2,077.92 = 1,200.72/x
3. Step 3: Cross multiply
   1,386.48x = 2,077.92 × 1,200.72
4. Step 4: Simplify right side
   1,386.48x = 2,495,000.10
5. Step 5: Solve for x
   x = 2,495,000.10/1,386.48
6. Step 6: Final answer
   x = 1,799.52