Finding the Fourth Proportional to 76,549.86, 105,638.18 and 42,558.21

Step by Step Solution

1. Step 1: Write the proportion equation
   76,549.86 : 105,638.18 = 42,558.21 : x
2. Step 2: Convert to fraction form
   76,549.86/105,638.18 = 42,558.21/x
3. Step 3: Cross multiply
   76,549.86x = 105,638.18 × 42,558.21
4. Step 4: Simplify right side
   76,549.86x = 4,495,771,635.67
5. Step 5: Solve for x
   x = 4,495,771,635.67/76,549.86
6. Step 6: Final answer
   x = 58,729.98