Finding the Fourth Proportional to 91,966.95, 137,950.53 and 31,991.31

Step by Step Solution

1. Step 1: Write the proportion equation
   91,966.95 : 137,950.53 = 31,991.31 : x
2. Step 2: Convert to fraction form
   91,966.95/137,950.53 = 31,991.31/x
3. Step 3: Cross multiply
   91,966.95x = 137,950.53 × 31,991.31
4. Step 4: Simplify right side
   91,966.95x = 4,413,218,169.89
5. Step 5: Solve for x
   x = 4,413,218,169.89/91,966.95
6. Step 6: Final answer
   x = 47,987.00