Finding the Fourth Proportional to 101,978.43, 152,989.31 and 42,779.99

Step by Step Solution

1. Step 1: Write the proportion equation
   101,978.43 : 152,989.31 = 42,779.99 : x
2. Step 2: Convert to fraction form
   101,978.43/152,989.31 = 42,779.99/x
3. Step 3: Cross multiply
   101,978.43x = 152,989.31 × 42,779.99
4. Step 4: Simplify right side
   101,978.43x = 6,544,880,173.06
5. Step 5: Solve for x
   x = 6,544,880,173.06/101,978.43
6. Step 6: Final answer
   x = 64,179.06