Finding the Fourth Proportional to 286,188.74, 429,185.91 and 99,156.58

Step by Step Solution

1. Step 1: Write the proportion equation
   286,188.74 : 429,185.91 = 99,156.58 : x
2. Step 2: Convert to fraction form
   286,188.74/429,185.91 = 99,156.58/x
3. Step 3: Cross multiply
   286,188.74x = 429,185.91 × 99,156.58
4. Step 4: Simplify right side
   286,188.74x = 42,556,607,019.79
5. Step 5: Solve for x
   x = 42,556,607,019.79/286,188.74
6. Step 6: Final answer
   x = 148,701.19