Finding the Fourth Proportional to 31,788.42, 47,673.54 and 12,813

Step by Step Solution

1. Step 1: Write the proportion equation
   31,788.42 : 47,673.54 = 12,813 : x
2. Step 2: Convert to fraction form
   31,788.42/47,673.54 = 12,813/x
3. Step 3: Cross multiply
   31,788.42x = 47,673.54 × 12,813
4. Step 4: Simplify right side
   31,788.42x = 610,841,068.02
5. Step 5: Solve for x
   x = 610,841,068.02/31,788.42
6. Step 6: Final answer
   x = 19,215.84