Finding the Fourth Proportional to 35,439.17, 53,191.55 and 17,921.30

Step by Step Solution

1. Step 1: Write the proportion equation
   35,439.17 : 53,191.55 = 17,921.30 : x
2. Step 2: Convert to fraction form
   35,439.17/53,191.55 = 17,921.30/x
3. Step 3: Cross multiply
   35,439.17x = 53,191.55 × 17,921.30
4. Step 4: Simplify right side
   35,439.17x = 953,261,503.86
5. Step 5: Solve for x
   x = 953,261,503.86/35,439.17
6. Step 6: Final answer
   x = 26,898.53