Finding the Fourth Proportional to 123,072.89, 169,840.80 and 71,400.02

Step by Step Solution

1. Step 1: Write the proportion equation
   123,072.89 : 169,840.80 = 71,400.02 : x
2. Step 2: Convert to fraction form
   123,072.89/169,840.80 = 71,400.02/x
3. Step 3: Cross multiply
   123,072.89x = 169,840.80 × 71,400.02
4. Step 4: Simplify right side
   123,072.89x = 12,126,635,667.61
5. Step 5: Solve for x
   x = 12,126,635,667.61/123,072.89
6. Step 6: Final answer
   x = 98,532.15