Finding the Third Proportional to 553,612.50 and 903,991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   553,612.50 : 903,991.50 = 903,991.50 : x
2. Step 2: Convert to fraction form
   553,612.50/903,991.50 = 903,991.50/x
3. Step 3: Cross multiply
   553,612.50x = 903,991.50 × 903,991.50
4. Step 4: Simplify right side
   553,612.50x = 817,200,632,072.25
5. Step 5: Solve for x
   x = 817,200,632,072.25/553,612.50
6. Step 6: Final answer
   x = 1,476,123.88