Finding the Fourth Proportional to 112,390.56, 155,030.40 and 72,090.72

Step by Step Solution

1. Step 1: Write the proportion equation
   112,390.56 : 155,030.40 = 72,090.72 : x
2. Step 2: Convert to fraction form
   112,390.56/155,030.40 = 72,090.72/x
3. Step 3: Cross multiply
   112,390.56x = 155,030.40 × 72,090.72
4. Step 4: Simplify right side
   112,390.56x = 11,176,253,157.89
5. Step 5: Solve for x
   x = 11,176,253,157.89/112,390.56
6. Step 6: Final answer
   x = 99,441.21