Finding the Fourth Proportional to 61,643, 85,242.30 and 58,858.22

Step by Step Solution

1. Step 1: Write the proportion equation
   61,643 : 85,242.30 = 58,858.22 : x
2. Step 2: Convert to fraction form
   61,643/85,242.30 = 58,858.22/x
3. Step 3: Cross multiply
   61,643x = 85,242.30 × 58,858.22
4. Step 4: Simplify right side
   61,643x = 5,017,210,046.71
5. Step 5: Solve for x
   x = 5,017,210,046.71/61,643
6. Step 6: Final answer
   x = 81,391.40