Finding the Fourth Proportional to 42,547.10, 63,829.86 and 12,964.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,547.10 : 63,829.86 = 12,964.16 : x
2. Step 2: Convert to fraction form
   42,547.10/63,829.86 = 12,964.16/x
3. Step 3: Cross multiply
   42,547.10x = 63,829.86 × 12,964.16
4. Step 4: Simplify right side
   42,547.10x = 827,500,517.82
5. Step 5: Solve for x
   x = 827,500,517.82/42,547.10
6. Step 6: Final answer
   x = 19,449.05