Finding the Fourth Proportional to 123,106.42, 169,899.91 and 72,161.95

Step by Step Solution

1. Step 1: Write the proportion equation
   123,106.42 : 169,899.91 = 72,161.95 : x
2. Step 2: Convert to fraction form
   123,106.42/169,899.91 = 72,161.95/x
3. Step 3: Cross multiply
   123,106.42x = 169,899.91 × 72,161.95
4. Step 4: Simplify right side
   123,106.42x = 12,260,308,810.42
5. Step 5: Solve for x
   x = 12,260,308,810.42/123,106.42
6. Step 6: Final answer
   x = 99,591.14