Finding the Fourth Proportional to 105,931.28, 158,894.86 and 42,749.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,931.28 : 158,894.86 = 42,749.72 : x
2. Step 2: Convert to fraction form
   105,931.28/158,894.86 = 42,749.72/x
3. Step 3: Cross multiply
   105,931.28x = 158,894.86 × 42,749.72
4. Step 4: Simplify right side
   105,931.28x = 6,792,710,774.44
5. Step 5: Solve for x
   x = 6,792,710,774.44/105,931.28
6. Step 6: Final answer
   x = 64,123.75