Finding the Fourth Proportional to 31,940.51, 47,916.53 and 13,210.37

Step by Step Solution

1. Step 1: Write the proportion equation
   31,940.51 : 47,916.53 = 13,210.37 : x
2. Step 2: Convert to fraction form
   31,940.51/47,916.53 = 13,210.37/x
3. Step 3: Cross multiply
   31,940.51x = 47,916.53 × 13,210.37
4. Step 4: Simplify right side
   31,940.51x = 632,994,784.78
5. Step 5: Solve for x
   x = 632,994,784.78/31,940.51
6. Step 6: Final answer
   x = 19,817.93