Finding the Fourth Proportional to 51,787.48, 71,438.70 and 42,781.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51,787.48 : 71,438.70 = 42,781.72 : x
2. Step 2: Convert to fraction form
   51,787.48/71,438.70 = 42,781.72/x
3. Step 3: Cross multiply
   51,787.48x = 71,438.70 × 42,781.72
4. Step 4: Simplify right side
   51,787.48x = 3,056,270,460.56
5. Step 5: Solve for x
   x = 3,056,270,460.56/51,787.48
6. Step 6: Final answer
   x = 59,015.62