Finding the Fourth Proportional to 1,662.78, 2,490.89 and 930.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.78 : 2,490.89 = 930.12 : x
2. Step 2: Convert to fraction form
   1,662.78/2,490.89 = 930.12/x
3. Step 3: Cross multiply
   1,662.78x = 2,490.89 × 930.12
4. Step 4: Simplify right side
   1,662.78x = 2,316,826.61
5. Step 5: Solve for x
   x = 2,316,826.61/1,662.78
6. Step 6: Final answer
   x = 1,393.35