Finding the Fourth Proportional to 42,697.32, 64,055.49 and 13,118.14

Step by Step Solution

1. Step 1: Write the proportion equation
   42,697.32 : 64,055.49 = 13,118.14 : x
2. Step 2: Convert to fraction form
   42,697.32/64,055.49 = 13,118.14/x
3. Step 3: Cross multiply
   42,697.32x = 64,055.49 × 13,118.14
4. Step 4: Simplify right side
   42,697.32x = 840,288,885.59
5. Step 5: Solve for x
   x = 840,288,885.59/42,697.32
6. Step 6: Final answer
   x = 19,680.13