Finding the Fourth Proportional to 42,881.38, 64,328.29 and 13,301.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,881.38 : 64,328.29 = 13,301.60 : x
2. Step 2: Convert to fraction form
   42,881.38/64,328.29 = 13,301.60/x
3. Step 3: Cross multiply
   42,881.38x = 64,328.29 × 13,301.60
4. Step 4: Simplify right side
   42,881.38x = 855,668,827.37
5. Step 5: Solve for x
   x = 855,668,827.37/42,881.38
6. Step 6: Final answer
   x = 19,954.32