Finding the Fourth Proportional to 10,408,059.89, 15,621,057.91 and 7,215,428.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,408,059.89 : 15,621,057.91 = 7,215,428.09 : x
2. Step 2: Convert to fraction form
   10,408,059.89/15,621,057.91 = 7,215,428.09/x
3. Step 3: Cross multiply
   10,408,059.89x = 15,621,057.91 × 7,215,428.09
4. Step 4: Simplify right side
   10,408,059.89x = 112,712,620,039,330.69
5. Step 5: Solve for x
   x = 112,712,620,039,330.69/10,408,059.89
6. Step 6: Final answer
   x = 10,829,359.29