Finding the Fourth Proportional to 52,389.84, 78,516.72 and 21,208.08

Step by Step Solution

1. Step 1: Write the proportion equation
   52,389.84 : 78,516.72 = 21,208.08 : x
2. Step 2: Convert to fraction form
   52,389.84/78,516.72 = 21,208.08/x
3. Step 3: Cross multiply
   52,389.84x = 78,516.72 × 21,208.08
4. Step 4: Simplify right side
   52,389.84x = 1,665,188,879.10
5. Step 5: Solve for x
   x = 1,665,188,879.10/52,389.84
6. Step 6: Final answer
   x = 31,784.58