Finding the Fourth Proportional to 100,947.12, 139,311.72 and 58,518.96

Step by Step Solution

1. Step 1: Write the proportion equation
   100,947.12 : 139,311.72 = 58,518.96 : x
2. Step 2: Convert to fraction form
   100,947.12/139,311.72 = 58,518.96/x
3. Step 3: Cross multiply
   100,947.12x = 139,311.72 × 58,518.96
4. Step 4: Simplify right side
   100,947.12x = 8,152,376,970.21
5. Step 5: Solve for x
   x = 8,152,376,970.21/100,947.12
6. Step 6: Final answer
   x = 80,758.89