Finding the Fourth Proportional to 42,428.62, 63,634.59 and 40,320.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,428.62 : 63,634.59 = 40,320.88 : x
2. Step 2: Convert to fraction form
   42,428.62/63,634.59 = 40,320.88/x
3. Step 3: Cross multiply
   42,428.62x = 63,634.59 × 40,320.88
4. Step 4: Simplify right side
   42,428.62x = 2,565,802,667.24
5. Step 5: Solve for x
   x = 2,565,802,667.24/42,428.62
6. Step 6: Final answer
   x = 60,473.39