Finding the Fourth Proportional to 1,662.30, 2,492.06 and 784.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.30 : 2,492.06 = 784.31 : x
2. Step 2: Convert to fraction form
   1,662.30/2,492.06 = 784.31/x
3. Step 3: Cross multiply
   1,662.30x = 2,492.06 × 784.31
4. Step 4: Simplify right side
   1,662.30x = 1,954,531.20
5. Step 5: Solve for x
   x = 1,954,531.20/1,662.30
6. Step 6: Final answer
   x = 1,175.80