Finding the Fourth Proportional to 121,788.55, 182,678.71 and 42,900.72

Step by Step Solution

1. Step 1: Write the proportion equation
   121,788.55 : 182,678.71 = 42,900.72 : x
2. Step 2: Convert to fraction form
   121,788.55/182,678.71 = 42,900.72/x
3. Step 3: Cross multiply
   121,788.55x = 182,678.71 × 42,900.72
4. Step 4: Simplify right side
   121,788.55x = 7,837,048,187.67
5. Step 5: Solve for x
   x = 7,837,048,187.67/121,788.55
6. Step 6: Final answer
   x = 64,349.63