Finding the Fourth Proportional to 42,679,836.56, 64,019,921.60 and 10,331,686.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,679,836.56 : 64,019,921.60 = 10,331,686.28 : x
2. Step 2: Convert to fraction form
   42,679,836.56/64,019,921.60 = 10,331,686.28/x
3. Step 3: Cross multiply
   42,679,836.56x = 64,019,921.60 × 10,331,686.28
4. Step 4: Simplify right side
   42,679,836.56x = 661,433,745,827,274.75
5. Step 5: Solve for x
   x = 661,433,745,827,274.75/42,679,836.56
6. Step 6: Final answer
   x = 15,497,569.79