Finding the Third Proportional to 697,485.50 and 987,213

Step by Step Solution

1. Step 1: Write the proportion equation
   697,485.50 : 987,213 = 987,213 : x
2. Step 2: Convert to fraction form
   697,485.50/987,213 = 987,213/x
3. Step 3: Cross multiply
   697,485.50x = 987,213 × 987,213
4. Step 4: Simplify right side
   697,485.50x = 974,589,507,369
5. Step 5: Solve for x
   x = 974,589,507,369/697,485.50
6. Step 6: Final answer
   x = 1,397,289.99