Finding the Fourth Proportional to 21,068.32, 31,368.48 and 20,774.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,068.32 : 31,368.48 = 20,774.06 : x
2. Step 2: Convert to fraction form
   21,068.32/31,368.48 = 20,774.06/x
3. Step 3: Cross multiply
   21,068.32x = 31,368.48 × 20,774.06
4. Step 4: Simplify right side
   21,068.32x = 651,650,773.59
5. Step 5: Solve for x
   x = 651,650,773.59/21,068.32
6. Step 6: Final answer
   x = 30,930.36