Finding the Fourth Proportional to 30,916.72, 42,642.48 and 19,588.16

Step by Step Solution

1. Step 1: Write the proportion equation
   30,916.72 : 42,642.48 = 19,588.16 : x
2. Step 2: Convert to fraction form
   30,916.72/42,642.48 = 19,588.16/x
3. Step 3: Cross multiply
   30,916.72x = 42,642.48 × 19,588.16
4. Step 4: Simplify right side
   30,916.72x = 835,287,721.04
5. Step 5: Solve for x
   x = 835,287,721.04/30,916.72
6. Step 6: Final answer
   x = 27,017.35