Finding the Fourth Proportional to 72,931.58, 100,645.71 and 42,310.61

Step by Step Solution

1. Step 1: Write the proportion equation
   72,931.58 : 100,645.71 = 42,310.61 : x
2. Step 2: Convert to fraction form
   72,931.58/100,645.71 = 42,310.61/x
3. Step 3: Cross multiply
   72,931.58x = 100,645.71 × 42,310.61
4. Step 4: Simplify right side
   72,931.58x = 4,258,381,383.98
5. Step 5: Solve for x
   x = 4,258,381,383.98/72,931.58
6. Step 6: Final answer
   x = 58,388.72