Finding the Fourth Proportional to 91,590.42, 137,405.37 and 28,409.29

Step by Step Solution

1. Step 1: Write the proportion equation
   91,590.42 : 137,405.37 = 28,409.29 : x
2. Step 2: Convert to fraction form
   91,590.42/137,405.37 = 28,409.29/x
3. Step 3: Cross multiply
   91,590.42x = 137,405.37 × 28,409.29
4. Step 4: Simplify right side
   91,590.42x = 3,903,589,003.89
5. Step 5: Solve for x
   x = 3,903,589,003.89/91,590.42
6. Step 6: Final answer
   x = 42,620.06