Finding the Fourth Proportional to 112,510.18, 155,190.89 and 72,160.03

Step by Step Solution

1. Step 1: Write the proportion equation
   112,510.18 : 155,190.89 = 72,160.03 : x
2. Step 2: Convert to fraction form
   112,510.18/155,190.89 = 72,160.03/x
3. Step 3: Cross multiply
   112,510.18x = 155,190.89 × 72,160.03
4. Step 4: Simplify right side
   112,510.18x = 11,198,578,810.14
5. Step 5: Solve for x
   x = 11,198,578,810.14/112,510.18
6. Step 6: Final answer
   x = 99,533.92