Finding the Fourth Proportional to 105,128.40, 145,081.50 and 59,814.36

Step by Step Solution

1. Step 1: Write the proportion equation
   105,128.40 : 145,081.50 = 59,814.36 : x
2. Step 2: Convert to fraction form
   105,128.40/145,081.50 = 59,814.36/x
3. Step 3: Cross multiply
   105,128.40x = 145,081.50 × 59,814.36
4. Step 4: Simplify right side
   105,128.40x = 8,677,957,070.34
5. Step 5: Solve for x
   x = 8,677,957,070.34/105,128.40
6. Step 6: Final answer
   x = 82,546.27