Finding the Fourth Proportional to 99,692.61, 149,478.67 and 39,730.31

Step by Step Solution

1. Step 1: Write the proportion equation
   99,692.61 : 149,478.67 = 39,730.31 : x
2. Step 2: Convert to fraction form
   99,692.61/149,478.67 = 39,730.31/x
3. Step 3: Cross multiply
   99,692.61x = 149,478.67 × 39,730.31
4. Step 4: Simplify right side
   99,692.61x = 5,938,834,171.86
5. Step 5: Solve for x
   x = 5,938,834,171.86/99,692.61
6. Step 6: Final answer
   x = 59,571.46