Finding the Fourth Proportional to 42,806.38, 59,068.78 and 28,980.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,806.38 : 59,068.78 = 28,980.58 : x
2. Step 2: Convert to fraction form
   42,806.38/59,068.78 = 28,980.58/x
3. Step 3: Cross multiply
   42,806.38x = 59,068.78 × 28,980.58
4. Step 4: Simplify right side
   42,806.38x = 1,711,847,507.06
5. Step 5: Solve for x
   x = 1,711,847,507.06/42,806.38
6. Step 6: Final answer
   x = 39,990.48