Finding the Fourth Proportional to 42,506.33, 63,761.76 and 12,921.93

Step by Step Solution

1. Step 1: Write the proportion equation
   42,506.33 : 63,761.76 = 12,921.93 : x
2. Step 2: Convert to fraction form
   42,506.33/63,761.76 = 12,921.93/x
3. Step 3: Cross multiply
   42,506.33x = 63,761.76 × 12,921.93
4. Step 4: Simplify right side
   42,506.33x = 823,924,999.40
5. Step 5: Solve for x
   x = 823,924,999.40/42,506.33
6. Step 6: Final answer
   x = 19,383.59