Finding the Fourth Proportional to 42,072.13, 63,097.35 and 12,483.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,072.13 : 63,097.35 = 12,483.28 : x
2. Step 2: Convert to fraction form
   42,072.13/63,097.35 = 12,483.28/x
3. Step 3: Cross multiply
   42,072.13x = 63,097.35 × 12,483.28
4. Step 4: Simplify right side
   42,072.13x = 787,661,887.31
5. Step 5: Solve for x
   x = 787,661,887.31/42,072.13
6. Step 6: Final answer
   x = 18,721.70