Finding the Fourth Proportional to 31,147.60, 42,999.36 and 19,828.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,147.60 : 42,999.36 = 19,828.48 : x
2. Step 2: Convert to fraction form
   31,147.60/42,999.36 = 19,828.48/x
3. Step 3: Cross multiply
   31,147.60x = 42,999.36 × 19,828.48
4. Step 4: Simplify right side
   31,147.60x = 852,611,949.77
5. Step 5: Solve for x
   x = 852,611,949.77/31,147.60
6. Step 6: Final answer
   x = 27,373.28