Finding the Fourth Proportional to 42,638.16, 63,978.84 and 28,758

Step by Step Solution

1. Step 1: Write the proportion equation
   42,638.16 : 63,978.84 = 28,758 : x
2. Step 2: Convert to fraction form
   42,638.16/63,978.84 = 28,758/x
3. Step 3: Cross multiply
   42,638.16x = 63,978.84 × 28,758
4. Step 4: Simplify right side
   42,638.16x = 1,839,903,480.72
5. Step 5: Solve for x
   x = 1,839,903,480.72/42,638.16
6. Step 6: Final answer
   x = 43,151.57