Finding the Third Proportional to 1,390.61 and 1,492.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.61 : 1,492.17 = 1,492.17 : x
2. Step 2: Convert to fraction form
   1,390.61/1,492.17 = 1,492.17/x
3. Step 3: Cross multiply
   1,390.61x = 1,492.17 × 1,492.17
4. Step 4: Simplify right side
   1,390.61x = 2,226,576.90
5. Step 5: Solve for x
   x = 2,226,576.90/1,390.61
6. Step 6: Final answer
   x = 1,601.16