Finding the Fourth Proportional to 112,321.50, 155,003.67 and 72,577.50

Step by Step Solution

1. Step 1: Write the proportion equation
   112,321.50 : 155,003.67 = 72,577.50 : x
2. Step 2: Convert to fraction form
   112,321.50/155,003.67 = 72,577.50/x
3. Step 3: Cross multiply
   112,321.50x = 155,003.67 × 72,577.50
4. Step 4: Simplify right side
   112,321.50x = 11,249,778,859.43
5. Step 5: Solve for x
   x = 11,249,778,859.43/112,321.50
6. Step 6: Final answer
   x = 100,156.95