Finding the Fourth Proportional to 91,045, 136,591.80 and 28,715.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,045 : 136,591.80 = 28,715.50 : x
2. Step 2: Convert to fraction form
   91,045/136,591.80 = 28,715.50/x
3. Step 3: Cross multiply
   91,045x = 136,591.80 × 28,715.50
4. Step 4: Simplify right side
   91,045x = 3,922,301,832.90
5. Step 5: Solve for x
   x = 3,922,301,832.90/91,045
6. Step 6: Final answer
   x = 43,080.91