Finding the Fourth Proportional to 42,830.64, 64,255.38 and 12,843.66

Step by Step Solution

1. Step 1: Write the proportion equation
   42,830.64 : 64,255.38 = 12,843.66 : x
2. Step 2: Convert to fraction form
   42,830.64/64,255.38 = 12,843.66/x
3. Step 3: Cross multiply
   42,830.64x = 64,255.38 × 12,843.66
4. Step 4: Simplify right side
   42,830.64x = 825,274,253.89
5. Step 5: Solve for x
   x = 825,274,253.89/42,830.64
6. Step 6: Final answer
   x = 19,268.31