Finding the Fourth Proportional to 100,758, 139,013.52 and 64,884.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,758 : 139,013.52 = 64,884.72 : x
2. Step 2: Convert to fraction form
   100,758/139,013.52 = 64,884.72/x
3. Step 3: Cross multiply
   100,758x = 139,013.52 × 64,884.72
4. Step 4: Simplify right side
   100,758x = 9,019,853,321.41
5. Step 5: Solve for x
   x = 9,019,853,321.41/100,758
6. Step 6: Final answer
   x = 89,519.97