Finding the Fourth Proportional to 91,290.02, 136,967.84 and 80,333.15

Step by Step Solution

1. Step 1: Write the proportion equation
   91,290.02 : 136,967.84 = 80,333.15 : x
2. Step 2: Convert to fraction form
   91,290.02/136,967.84 = 80,333.15/x
3. Step 3: Cross multiply
   91,290.02x = 136,967.84 × 80,333.15
4. Step 4: Simplify right side
   91,290.02x = 11,003,056,949.39
5. Step 5: Solve for x
   x = 11,003,056,949.39/91,290.02
6. Step 6: Final answer
   x = 120,528.59