Finding the Fourth Proportional to 91,323.39, 137,012.78 and 64,720.82

Step by Step Solution

1. Step 1: Write the proportion equation
   91,323.39 : 137,012.78 = 64,720.82 : x
2. Step 2: Convert to fraction form
   91,323.39/137,012.78 = 64,720.82/x
3. Step 3: Cross multiply
   91,323.39x = 137,012.78 × 64,720.82
4. Step 4: Simplify right side
   91,323.39x = 8,867,578,463.41
5. Step 5: Solve for x
   x = 8,867,578,463.41/91,323.39
6. Step 6: Final answer
   x = 97,100.85