Finding the Fourth Proportional to 1,577.31, 2,367.86 and 928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,577.31 : 2,367.86 = 928.50 : x
2. Step 2: Convert to fraction form
   1,577.31/2,367.86 = 928.50/x
3. Step 3: Cross multiply
   1,577.31x = 2,367.86 × 928.50
4. Step 4: Simplify right side
   1,577.31x = 2,198,553.37
5. Step 5: Solve for x
   x = 2,198,553.37/1,577.31
6. Step 6: Final answer
   x = 1,393.86