Finding the Fourth Proportional to 105,961.72, 158,881 and 42,730.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105,961.72 : 158,881 = 42,730.07 : x
2. Step 2: Convert to fraction form
   105,961.72/158,881 = 42,730.07/x
3. Step 3: Cross multiply
   105,961.72x = 158,881 × 42,730.07
4. Step 4: Simplify right side
   105,961.72x = 6,788,996,251.67
5. Step 5: Solve for x
   x = 6,788,996,251.67/105,961.72
6. Step 6: Final answer
   x = 64,070.27