Finding the Fourth Proportional to 42,894.90, 64,348.56 and 13,315.14

Step by Step Solution

1. Step 1: Write the proportion equation
   42,894.90 : 64,348.56 = 13,315.14 : x
2. Step 2: Convert to fraction form
   42,894.90/64,348.56 = 13,315.14/x
3. Step 3: Cross multiply
   42,894.90x = 64,348.56 × 13,315.14
4. Step 4: Simplify right side
   42,894.90x = 856,810,085.20
5. Step 5: Solve for x
   x = 856,810,085.20/42,894.90
6. Step 6: Final answer
   x = 19,974.64