Finding the Third Proportional to 553,218 and 841,305.75

Step by Step Solution

1. Step 1: Write the proportion equation
   553,218 : 841,305.75 = 841,305.75 : x
2. Step 2: Convert to fraction form
   553,218/841,305.75 = 841,305.75/x
3. Step 3: Cross multiply
   553,218x = 841,305.75 × 841,305.75
4. Step 4: Simplify right side
   553,218x = 707,795,364,983.06
5. Step 5: Solve for x
   x = 707,795,364,983.06/553,218
6. Step 6: Final answer
   x = 1,279,414.92