Finding the Fourth Proportional to 58,631.52, 81,018.64 and 42,688.16

Step by Step Solution

1. Step 1: Write the proportion equation
   58,631.52 : 81,018.64 = 42,688.16 : x
2. Step 2: Convert to fraction form
   58,631.52/81,018.64 = 42,688.16/x
3. Step 3: Cross multiply
   58,631.52x = 81,018.64 × 42,688.16
4. Step 4: Simplify right side
   58,631.52x = 3,458,536,667.30
5. Step 5: Solve for x
   x = 3,458,536,667.30/58,631.52
6. Step 6: Final answer
   x = 58,987.67