Finding the Fourth Proportional to 42,807.96, 64,138.14 and 30,306.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,807.96 : 64,138.14 = 30,306.78 : x
2. Step 2: Convert to fraction form
   42,807.96/64,138.14 = 30,306.78/x
3. Step 3: Cross multiply
   42,807.96x = 64,138.14 × 30,306.78
4. Step 4: Simplify right side
   42,807.96x = 1,943,820,498.59
5. Step 5: Solve for x
   x = 1,943,820,498.59/42,807.96
6. Step 6: Final answer
   x = 45,407.92