Finding the Fourth Proportional to 105,881.10, 158,819.60 and 42,699.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,881.10 : 158,819.60 = 42,699.80 : x
2. Step 2: Convert to fraction form
   105,881.10/158,819.60 = 42,699.80/x
3. Step 3: Cross multiply
   105,881.10x = 158,819.60 × 42,699.80
4. Step 4: Simplify right side
   105,881.10x = 6,781,565,339.63
5. Step 5: Solve for x
   x = 6,781,565,339.63/105,881.10
6. Step 6: Final answer
   x = 64,048.88