Finding the Fourth Proportional to 156,459.89, 215,905.61 and 91,919.09

Step by Step Solution

1. Step 1: Write the proportion equation
   156,459.89 : 215,905.61 = 91,919.09 : x
2. Step 2: Convert to fraction form
   156,459.89/215,905.61 = 91,919.09/x
3. Step 3: Cross multiply
   156,459.89x = 215,905.61 × 91,919.09
4. Step 4: Simplify right side
   156,459.89x = 19,845,847,197.09
5. Step 5: Solve for x
   x = 19,845,847,197.09/156,459.89
6. Step 6: Final answer
   x = 126,843.03