Finding the Fourth Proportional to 72,911.77, 109,376.78 and 28,532.79

Step by Step Solution

1. Step 1: Write the proportion equation
   72,911.77 : 109,376.78 = 28,532.79 : x
2. Step 2: Convert to fraction form
   72,911.77/109,376.78 = 28,532.79/x
3. Step 3: Cross multiply
   72,911.77x = 109,376.78 × 28,532.79
4. Step 4: Simplify right side
   72,911.77x = 3,120,824,551.95
5. Step 5: Solve for x
   x = 3,120,824,551.95/72,911.77
6. Step 6: Final answer
   x = 42,802.76