Finding the Fourth Proportional to 28,359.91, 42,495.72 and 10,820.17

Step by Step Solution

1. Step 1: Write the proportion equation
   28,359.91 : 42,495.72 = 10,820.17 : x
2. Step 2: Convert to fraction form
   28,359.91/42,495.72 = 10,820.17/x
3. Step 3: Cross multiply
   28,359.91x = 42,495.72 × 10,820.17
4. Step 4: Simplify right side
   28,359.91x = 459,810,914.67
5. Step 5: Solve for x
   x = 459,810,914.67/28,359.91
6. Step 6: Final answer
   x = 16,213.41