Finding the Fourth Proportional to 72,611.67, 108,375.79 and 70,839.93

Step by Step Solution

1. Step 1: Write the proportion equation
   72,611.67 : 108,375.79 = 70,839.93 : x
2. Step 2: Convert to fraction form
   72,611.67/108,375.79 = 70,839.93/x
3. Step 3: Cross multiply
   72,611.67x = 108,375.79 × 70,839.93
4. Step 4: Simplify right side
   72,611.67x = 7,677,333,377.29
5. Step 5: Solve for x
   x = 7,677,333,377.29/72,611.67
6. Step 6: Final answer
   x = 105,731.40