Finding the Fourth Proportional to 42,665.75, 63,912.95 and 21,253.98

Step by Step Solution

1. Step 1: Write the proportion equation
   42,665.75 : 63,912.95 = 21,253.98 : x
2. Step 2: Convert to fraction form
   42,665.75/63,912.95 = 21,253.98/x
3. Step 3: Cross multiply
   42,665.75x = 63,912.95 × 21,253.98
4. Step 4: Simplify right side
   42,665.75x = 1,358,404,454.77
5. Step 5: Solve for x
   x = 1,358,404,454.77/42,665.75
6. Step 6: Final answer
   x = 31,838.29