Finding the Fourth Proportional to 42,278.10, 63,426.87 and 12,696.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,278.10 : 63,426.87 = 12,696.50 : x
2. Step 2: Convert to fraction form
   42,278.10/63,426.87 = 12,696.50/x
3. Step 3: Cross multiply
   42,278.10x = 63,426.87 × 12,696.50
4. Step 4: Simplify right side
   42,278.10x = 805,298,937.82
5. Step 5: Solve for x
   x = 805,298,937.82/42,278.10
6. Step 6: Final answer
   x = 19,047.66