Finding the Third Proportional to 1,158,840 and 1,861,380

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158,840 : 1,861,380 = 1,861,380 : x
2. Step 2: Convert to fraction form
   1,158,840/1,861,380 = 1,861,380/x
3. Step 3: Cross multiply
   1,158,840x = 1,861,380 × 1,861,380
4. Step 4: Simplify right side
   1,158,840x = 3,464,735,504,400
5. Step 5: Solve for x
   x = 3,464,735,504,400/1,158,840
6. Step 6: Final answer
   x = 2,989,830.78