Finding the Fourth Proportional to 153,774.72, 212,209.41 and 85,789.98

Step by Step Solution

1. Step 1: Write the proportion equation
   153,774.72 : 212,209.41 = 85,789.98 : x
2. Step 2: Convert to fraction form
   153,774.72/212,209.41 = 85,789.98/x
3. Step 3: Cross multiply
   153,774.72x = 212,209.41 × 85,789.98
4. Step 4: Simplify right side
   153,774.72x = 18,205,441,039.71
5. Step 5: Solve for x
   x = 18,205,441,039.71/153,774.72
6. Step 6: Final answer
   x = 118,390.34