Finding the Fourth Proportional to 78,971.76, 118,458.15 and 31,590.81

Step by Step Solution

1. Step 1: Write the proportion equation
   78,971.76 : 118,458.15 = 31,590.81 : x
2. Step 2: Convert to fraction form
   78,971.76/118,458.15 = 31,590.81/x
3. Step 3: Cross multiply
   78,971.76x = 118,458.15 × 31,590.81
4. Step 4: Simplify right side
   78,971.76x = 3,742,188,909.60
5. Step 5: Solve for x
   x = 3,742,188,909.60/78,971.76
6. Step 6: Final answer
   x = 47,386.42