Finding the Fourth Proportional to 90,881, 136,311.76 and 31,717.80

Step by Step Solution

1. Step 1: Write the proportion equation
   90,881 : 136,311.76 = 31,717.80 : x
2. Step 2: Convert to fraction form
   90,881/136,311.76 = 31,717.80/x
3. Step 3: Cross multiply
   90,881x = 136,311.76 × 31,717.80
4. Step 4: Simplify right side
   90,881x = 4,323,509,141.33
5. Step 5: Solve for x
   x = 4,323,509,141.33/90,881
6. Step 6: Final answer
   x = 47,573.30