Finding the Fourth Proportional to 42,820.56, 64,208.16 and 15,099.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,820.56 : 64,208.16 = 15,099.12 : x
2. Step 2: Convert to fraction form
   42,820.56/64,208.16 = 15,099.12/x
3. Step 3: Cross multiply
   42,820.56x = 64,208.16 × 15,099.12
4. Step 4: Simplify right side
   42,820.56x = 969,486,712.82
5. Step 5: Solve for x
   x = 969,486,712.82/42,820.56
6. Step 6: Final answer
   x = 22,640.68