Finding the Third Proportional to 5,429,915.63 and 7,978,661.25

Step by Step Solution

1. Step 1: Write the proportion equation
   5,429,915.63 : 7,978,661.25 = 7,978,661.25 : x
2. Step 2: Convert to fraction form
   5,429,915.63/7,978,661.25 = 7,978,661.25/x
3. Step 3: Cross multiply
   5,429,915.63x = 7,978,661.25 × 7,978,661.25
4. Step 4: Simplify right side
   5,429,915.63x = 63,659,035,342,251.56
5. Step 5: Solve for x
   x = 63,659,035,342,251.56/5,429,915.63
6. Step 6: Final answer
   x = 11,723,761.42