Finding the Fourth Proportional to 306,099.57, 459,148.72 and 81,459.98

Step by Step Solution

1. Step 1: Write the proportion equation
   306,099.57 : 459,148.72 = 81,459.98 : x
2. Step 2: Convert to fraction form
   306,099.57/459,148.72 = 81,459.98/x
3. Step 3: Cross multiply
   306,099.57x = 459,148.72 × 81,459.98
4. Step 4: Simplify right side
   306,099.57x = 37,402,245,548.23
5. Step 5: Solve for x
   x = 37,402,245,548.23/306,099.57
6. Step 6: Final answer
   x = 122,189.80