Finding the Fourth Proportional to 131,688, 181,730.88 and 72,072

Step by Step Solution

1. Step 1: Write the proportion equation
   131,688 : 181,730.88 = 72,072 : x
2. Step 2: Convert to fraction form
   131,688/181,730.88 = 72,072/x
3. Step 3: Cross multiply
   131,688x = 181,730.88 × 72,072
4. Step 4: Simplify right side
   131,688x = 13,097,707,983.36
5. Step 5: Solve for x
   x = 13,097,707,983.36/131,688
6. Step 6: Final answer
   x = 99,460.15