Finding the Third Proportional to 420,813 and 651,901.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,813 : 651,901.50 = 651,901.50 : x
2. Step 2: Convert to fraction form
   420,813/651,901.50 = 651,901.50/x
3. Step 3: Cross multiply
   420,813x = 651,901.50 × 651,901.50
4. Step 4: Simplify right side
   420,813x = 424,975,565,702.25
5. Step 5: Solve for x
   x = 424,975,565,702.25/420,813
6. Step 6: Final answer
   x = 1,009,891.72