Finding the Fourth Proportional to 78,575.31, 108,430.32 and 42,765.21

Step by Step Solution

1. Step 1: Write the proportion equation
   78,575.31 : 108,430.32 = 42,765.21 : x
2. Step 2: Convert to fraction form
   78,575.31/108,430.32 = 42,765.21/x
3. Step 3: Cross multiply
   78,575.31x = 108,430.32 × 42,765.21
4. Step 4: Simplify right side
   78,575.31x = 4,637,045,405.17
5. Step 5: Solve for x
   x = 4,637,045,405.17/78,575.31
6. Step 6: Final answer
   x = 59,014.03