Finding the Third Proportional to 653,643 and 891,123.19

Step by Step Solution

1. Step 1: Write the proportion equation
   653,643 : 891,123.19 = 891,123.19 : x
2. Step 2: Convert to fraction form
   653,643/891,123.19 = 891,123.19/x
3. Step 3: Cross multiply
   653,643x = 891,123.19 × 891,123.19
4. Step 4: Simplify right side
   653,643x = 794,100,535,300.16
5. Step 5: Solve for x
   x = 794,100,535,300.16/653,643
6. Step 6: Final answer
   x = 1,214,884.17