Finding the Fourth Proportional to 42,639.16, 63,980.34 and 28,759

Step by Step Solution

1. Step 1: Write the proportion equation
   42,639.16 : 63,980.34 = 28,759 : x
2. Step 2: Convert to fraction form
   42,639.16/63,980.34 = 28,759/x
3. Step 3: Cross multiply
   42,639.16x = 63,980.34 × 28,759
4. Step 4: Simplify right side
   42,639.16x = 1,840,010,598.06
5. Step 5: Solve for x
   x = 1,840,010,598.06/42,639.16
6. Step 6: Final answer
   x = 43,153.07