Finding the Fourth Proportional to 120,085.61, 180,131.50 and 56,890.93

Step by Step Solution

1. Step 1: Write the proportion equation
   120,085.61 : 180,131.50 = 56,890.93 : x
2. Step 2: Convert to fraction form
   120,085.61/180,131.50 = 56,890.93/x
3. Step 3: Cross multiply
   120,085.61x = 180,131.50 × 56,890.93
4. Step 4: Simplify right side
   120,085.61x = 10,247,848,272.84
5. Step 5: Solve for x
   x = 10,247,848,272.84/120,085.61
6. Step 6: Final answer
   x = 85,337.85