Finding the Fourth Proportional to 16,905.31, 23,321.47 and 10,938.91

Step by Step Solution

1. Step 1: Write the proportion equation
   16,905.31 : 23,321.47 = 10,938.91 : x
2. Step 2: Convert to fraction form
   16,905.31/23,321.47 = 10,938.91/x
3. Step 3: Cross multiply
   16,905.31x = 23,321.47 × 10,938.91
4. Step 4: Simplify right side
   16,905.31x = 255,111,317.44
5. Step 5: Solve for x
   x = 255,111,317.44/16,905.31
6. Step 6: Final answer
   x = 15,090.60