Finding the Fourth Proportional to 105,904.29, 158,892.89 and 66,415.17

Step by Step Solution

1. Step 1: Write the proportion equation
   105,904.29 : 158,892.89 = 66,415.17 : x
2. Step 2: Convert to fraction form
   105,904.29/158,892.89 = 66,415.17/x
3. Step 3: Cross multiply
   105,904.29x = 158,892.89 × 66,415.17
4. Step 4: Simplify right side
   105,904.29x = 10,552,897,969.07
5. Step 5: Solve for x
   x = 10,552,897,969.07/105,904.29
6. Step 6: Final answer
   x = 99,645.61