Finding the Fourth Proportional to 90,729.36, 136,108.59 and 31,581.93

Step by Step Solution

1. Step 1: Write the proportion equation
   90,729.36 : 136,108.59 = 31,581.93 : x
2. Step 2: Convert to fraction form
   90,729.36/136,108.59 = 31,581.93/x
3. Step 3: Cross multiply
   90,729.36x = 136,108.59 × 31,581.93
4. Step 4: Simplify right side
   90,729.36x = 4,298,571,961.78
5. Step 5: Solve for x
   x = 4,298,571,961.78/90,729.36
6. Step 6: Final answer
   x = 47,377.96