Finding the Fourth Proportional to 52,317, 78,475.50 and 13,405

Step by Step Solution

1. Step 1: Write the proportion equation
   52,317 : 78,475.50 = 13,405 : x
2. Step 2: Convert to fraction form
   52,317/78,475.50 = 13,405/x
3. Step 3: Cross multiply
   52,317x = 78,475.50 × 13,405
4. Step 4: Simplify right side
   52,317x = 1,051,964,077.50
5. Step 5: Solve for x
   x = 1,051,964,077.50/52,317
6. Step 6: Final answer
   x = 20,107.50