Finding the Fourth Proportional to 42,917.78, 64,375.29 and 12,932.19

Step by Step Solution

1. Step 1: Write the proportion equation
   42,917.78 : 64,375.29 = 12,932.19 : x
2. Step 2: Convert to fraction form
   42,917.78/64,375.29 = 12,932.19/x
3. Step 3: Cross multiply
   42,917.78x = 64,375.29 × 12,932.19
4. Step 4: Simplify right side
   42,917.78x = 832,513,481.59
5. Step 5: Solve for x
   x = 832,513,481.59/42,917.78
6. Step 6: Final answer
   x = 19,397.87