Finding the Fourth Proportional to 71,079.82, 106,656.64 and 28,990.78

Step by Step Solution

1. Step 1: Write the proportion equation
   71,079.82 : 106,656.64 = 28,990.78 : x
2. Step 2: Convert to fraction form
   71,079.82/106,656.64 = 28,990.78/x
3. Step 3: Cross multiply
   71,079.82x = 106,656.64 × 28,990.78
4. Step 4: Simplify right side
   71,079.82x = 3,092,059,185.78
5. Step 5: Solve for x
   x = 3,092,059,185.78/71,079.82
6. Step 6: Final answer
   x = 43,501.22