Finding the Fourth Proportional to 91,212.18, 136,839.53 and 31,241.30

Step by Step Solution

1. Step 1: Write the proportion equation
   91,212.18 : 136,839.53 = 31,241.30 : x
2. Step 2: Convert to fraction form
   91,212.18/136,839.53 = 31,241.30/x
3. Step 3: Cross multiply
   91,212.18x = 136,839.53 × 31,241.30
4. Step 4: Simplify right side
   91,212.18x = 4,275,044,026.76
5. Step 5: Solve for x
   x = 4,275,044,026.76/91,212.18
6. Step 6: Final answer
   x = 46,869.23