Finding the Fourth Proportional to 120,499.83, 180,858.16 and 64,387.91

Step by Step Solution

1. Step 1: Write the proportion equation
   120,499.83 : 180,858.16 = 64,387.91 : x
2. Step 2: Convert to fraction form
   120,499.83/180,858.16 = 64,387.91/x
3. Step 3: Cross multiply
   120,499.83x = 180,858.16 × 64,387.91
4. Step 4: Simplify right side
   120,499.83x = 11,645,078,271.71
5. Step 5: Solve for x
   x = 11,645,078,271.71/120,499.83
6. Step 6: Final answer
   x = 96,639.79