Finding the Fourth Proportional to 91,121, 136,682.72 and 31,958.40

Step by Step Solution

1. Step 1: Write the proportion equation
   91,121 : 136,682.72 = 31,958.40 : x
2. Step 2: Convert to fraction form
   91,121/136,682.72 = 31,958.40/x
3. Step 3: Cross multiply
   91,121x = 136,682.72 × 31,958.40
4. Step 4: Simplify right side
   91,121x = 4,368,161,038.85
5. Step 5: Solve for x
   x = 4,368,161,038.85/91,121
6. Step 6: Final answer
   x = 47,938.03