Finding the Fourth Proportional to 42,643.05, 64,030.18 and 38,006.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,643.05 : 64,030.18 = 38,006.61 : x
2. Step 2: Convert to fraction form
   42,643.05/64,030.18 = 38,006.61/x
3. Step 3: Cross multiply
   42,643.05x = 64,030.18 × 38,006.61
4. Step 4: Simplify right side
   42,643.05x = 2,433,570,079.49
5. Step 5: Solve for x
   x = 2,433,570,079.49/42,643.05
6. Step 6: Final answer
   x = 57,068.39