Finding the Fourth Proportional to 42,978.33, 64,540.19 and 28,010.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,978.33 : 64,540.19 = 28,010.88 : x
2. Step 2: Convert to fraction form
   42,978.33/64,540.19 = 28,010.88/x
3. Step 3: Cross multiply
   42,978.33x = 64,540.19 × 28,010.88
4. Step 4: Simplify right side
   42,978.33x = 1,807,827,587.29
5. Step 5: Solve for x
   x = 1,807,827,587.29/42,978.33
6. Step 6: Final answer
   x = 42,063.70