Finding the Fourth Proportional to 42,321.94, 63,474.88 and 21,256.34

Step by Step Solution

1. Step 1: Write the proportion equation
   42,321.94 : 63,474.88 = 21,256.34 : x
2. Step 2: Convert to fraction form
   42,321.94/63,474.88 = 21,256.34/x
3. Step 3: Cross multiply
   42,321.94x = 63,474.88 × 21,256.34
4. Step 4: Simplify right side
   42,321.94x = 1,349,243,418.91
5. Step 5: Solve for x
   x = 1,349,243,418.91/42,321.94
6. Step 6: Final answer
   x = 31,880.47