Finding the Third Proportional to 521,599.50 and 891,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   521,599.50 : 891,688.50 = 891,688.50 : x
2. Step 2: Convert to fraction form
   521,599.50/891,688.50 = 891,688.50/x
3. Step 3: Cross multiply
   521,599.50x = 891,688.50 × 891,688.50
4. Step 4: Simplify right side
   521,599.50x = 795,108,381,032.25
5. Step 5: Solve for x
   x = 795,108,381,032.25/521,599.50
6. Step 6: Final answer
   x = 1,524,365.69