Finding the Fourth Proportional to 28,156.70, 38,865.06 and 21,796.17

Step by Step Solution

1. Step 1: Write the proportion equation
   28,156.70 : 38,865.06 = 21,796.17 : x
2. Step 2: Convert to fraction form
   28,156.70/38,865.06 = 21,796.17/x
3. Step 3: Cross multiply
   28,156.70x = 38,865.06 × 21,796.17
4. Step 4: Simplify right side
   28,156.70x = 847,109,454.82
5. Step 5: Solve for x
   x = 847,109,454.82/28,156.70
6. Step 6: Final answer
   x = 30,085.54