Finding the Fourth Proportional to 42,888.12, 64,329.74 and 12,901.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,888.12 : 64,329.74 = 12,901.72 : x
2. Step 2: Convert to fraction form
   42,888.12/64,329.74 = 12,901.72/x
3. Step 3: Cross multiply
   42,888.12x = 64,329.74 × 12,901.72
4. Step 4: Simplify right side
   42,888.12x = 829,964,293.15
5. Step 5: Solve for x
   x = 829,964,293.15/42,888.12
6. Step 6: Final answer
   x = 19,351.85