Finding the Fourth Proportional to 13,317.31, 19,970.76 and 4,992.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,317.31 : 19,970.76 = 4,992.78 : x
2. Step 2: Convert to fraction form
   13,317.31/19,970.76 = 4,992.78/x
3. Step 3: Cross multiply
   13,317.31x = 19,970.76 × 4,992.78
4. Step 4: Simplify right side
   13,317.31x = 99,709,573.67
5. Step 5: Solve for x
   x = 99,709,573.67/13,317.31
6. Step 6: Final answer
   x = 7,487.22