Finding the Third Proportional to 209,151.50 and 429,426.50

Step by Step Solution

1. Step 1: Write the proportion equation
   209,151.50 : 429,426.50 = 429,426.50 : x
2. Step 2: Convert to fraction form
   209,151.50/429,426.50 = 429,426.50/x
3. Step 3: Cross multiply
   209,151.50x = 429,426.50 × 429,426.50
4. Step 4: Simplify right side
   209,151.50x = 184,407,118,902.25
5. Step 5: Solve for x
   x = 184,407,118,902.25/209,151.50
6. Step 6: Final answer
   x = 881,691.59