Finding the Fourth Proportional to 106,128.18, 146,457.59 and 58,380.30

Step by Step Solution

1. Step 1: Write the proportion equation
   106,128.18 : 146,457.59 = 58,380.30 : x
2. Step 2: Convert to fraction form
   106,128.18/146,457.59 = 58,380.30/x
3. Step 3: Cross multiply
   106,128.18x = 146,457.59 × 58,380.30
4. Step 4: Simplify right side
   106,128.18x = 8,550,237,749.58
5. Step 5: Solve for x
   x = 8,550,237,749.58/106,128.18
6. Step 6: Final answer
   x = 80,565.20