Finding the Fourth Proportional to 104,300.72, 156,450.77 and 90,218.87

Step by Step Solution

1. Step 1: Write the proportion equation
   104,300.72 : 156,450.77 = 90,218.87 : x
2. Step 2: Convert to fraction form
   104,300.72/156,450.77 = 90,218.87/x
3. Step 3: Cross multiply
   104,300.72x = 156,450.77 × 90,218.87
4. Step 4: Simplify right side
   104,300.72x = 14,114,811,680.03
5. Step 5: Solve for x
   x = 14,114,811,680.03/104,300.72
6. Step 6: Final answer
   x = 135,328.04